Blue-luminescent organic lead bromide perovskites: highly dispersible and photostable materialsElectronic supplementary information (ESI) available: Additional absorption, emission, TGA, XPS, NMR spectra of perovskite and precursors, as well as tables with photophysical and nanoparticle composition data. See DOI: 10.1039/c5ta01765c

The preparation of a blue-luminescent and photostable organic-inorganic hybrid perovskite with an X-ray powder diffraction spectrum consistent with a two-dimensional inorganic framework is reported. This perovskite can be produced with a high reaction yield and valuable optical properties, such as luminescence quantum yield over 20%, radiative rate constant of up to 80 × 10 6 s −1 , and high photostability under UV light. This material remains stable as a solid, is toluene-dispersible, and can be reverted reversibly into its precursors by using dimethylformamide (DMF). Moreover, the DMF dispersion can be injected into toluene to produce a nanomaterial or be used to prepare films by spin-coating on a substrate; both, the nanomaterial and the film exhibit practically the same optical features as the initial perovskite. Blue-luminescent and dispersible organic-inorganic hybrid perovskites can be produced with a high reaction yield and valuable optical properties, such as luminescence quantum yield over 20% and high photostability under UV light. This material can be assembled-disassembled reversibly.